alialarma
16.12.2020 •
Mathematics
2) Jake opened a savings account that earns 2.5% interest. Jake
estimates that, assuming he neither adds to nor withdraws from
his account, he will earn $240 in interest after 10 years. How
much did Jake deposit when he opened the account?
Solved
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Ответ:
Number of children=57
Number of adults=54
Step-by-step explanation:
We can start by forming simultaneous equations from the information provided.
Let the number of children be x and adults be y, then the the sum of the amount collected from both children and adults=3.25x+4y=401.25
The total number of people in attendance x+y=111
Let us solve these equations simultaneously.
3.25x+4y=401.25
x+y=111
Using substitution method.
y=111-x
3.25x+4(111-x)=401.25
3.25x+444-4x=401.25
-0.75cx=-42.75
x=57
Number of children=57
Adults=111-57
=54